Timer for food mixers



Aug. 3, 1954 A. w. HOLSTEIN 2,585,625

TIMER FOR FOOD MIXERS Filed March 29, 1952 2 Sheets-Sheet l llg- 3, 1954 A. w. HOLSTEIN 2,685,625

TIMER FOR FOOD MIXERS Filed March 29, 1952 2 Sheets-Sheet 2 Patented Aug. 3, 1954 UNITED STATES PATENT OFFICE Knapp-Monarch Company, corporation of Delaware St. Louis, Mo., a

Application March 29, 1952, Serial No. 279,374

(Cl. ZOO- 35) 9 Claims.

This invention relates to a timer or time switch particularly adapted for electrically operated food mixers, although it can be used for timing other electrically operated appliances and the like.

One object of the invention is to provide a time Switch mechanism including clockworks for the timing period which is mechanically connested with a switch operating member to cause the switch to open a circuit after a predetermined time that has been set on the timing mechanism as by rotation of a manually operated dial.

Another object is to provide a control knob or the like for simultaneously turning on the switch and setting the clock works tor the timing period, the clock works then operating after the dial is released for the purpose of turning the switch oii again at the eno". of the timing period.

Still another object is to provide a mechanical connection between the dial and the switch which permits the dial to be manually rotated backwards for closing the switch independent of the cloclrworlrs whereupon it remains closed until such time as the dial is again manipulated for manually opening the switch, thus providing a combined timer and manual on switch` A further object is to provide a cam and a rocker connection between a timing shaft and a switch operating arm which, upon setting of the timer mechanism, effects a rocking motion of the rocker to turn the switch on with a lobe of the cam passing the rocker and oa-mming it to the on position, after which the rocker rotates back to the original position as the timer mechanism rotates during the timing period and is in condition to drop ofi the lobe of the cam when it registers with the drop thereof at the end of the timing period.

Still a further object is to provide detent means for normally stopping the` rotation of the dial at the end of a timing period, this means, however, being capable of permitting the dial to be rotated in the same direction as it is driven by the clockworks for turning the switch on through the medium of an element carried by the dial and cooperating with the switch for this purpose, the detent then holding the dial in the on position until the dial is manually rotated back to the ofi position.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my timer for food mixers, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in the accompanying drawings, wherein:

Figure l is a partial side elevation of a food mixer to which my timer has been applied.

Figure 2 is an enlarged vertical sectional view on the line 2-2 of Figure l showing the timer mechanism.

Figure 3 is a sectional. View on the line 3-3 of Figure 2 to show the switch mechanism.

Figure l is a vertical sectional view on the line ll-fi of Figure 2 showing the timer in the off position.

Figure 5 is a detail of the detent mechanism on the line 5-5 or" Figure 4l when the timer is in the oii position.

Figure 6 is a view similar to a portion of Fgure 3 showing the switch in the closed circuit position as assumed during the timing period.

Figure 7 is a View similar to a portion of Figure showing the position of the parts right after the timer has been started on the resetting operation.

Figure 8 is a detail of the detent mechanism on the line -B of Figure 7.

Figure 9 is a view similar to Figure '7 showing in dotted lines the set position and in full lines the position of the parts when the timer is passing through the timing period.

Figure ,lo is a View similar to Figure 9 showing the position of the parts adjacent the end of the timing period when the switch is about to be turned nii.

figure ll is a detail ci the detent mechanism on the line l-l of Figure l0.

Figure l2 is a View similar to Figure 'i showing the mechanism adjusted for the manual on position aiter having assumed the "ofP position of Figure 4; and

Figure i3 is a detail of the detent mechanism on the line l-li of Figure l2.

On the accompanying drawings I have used the reference nume al to indicate a supportpost for iced mixer motor housing 22. This general type of food mixer is shown in my copenrling applications, Serial Nos. 272,036 and 2`2,@37, iiled February 1952. Beate): shafts 26 are shown depending from the motor housing 22 and are for the purpose of driving' food mixer and whipper elements as disclosed in the cepending applications referred lto. The present application has to do with a timer therefor that can be set to energize the motor of the food mixer for a predetermined, period of time.

My timer includes a housing 3l! and a timer shaft 2t on which is mounted a clockworksdriven element such as a gear 2E. A pair of discs 3i) and E3 are secured to the shaft 26 on opposite sides of the gear 28. A friction washer 32 is interposed between the disc 33 and the gear 28 so that the mechanism just described constitutes a friction clutch between the clockworks-driven element 23 and the timer shaft 26.

A timer shaft spring 3e is provided. which tends to rotate the timer shaft 26 in a counter-clockwise direction (as viewed in Figure Li). Clockworks are indicated generally at 3d and a pinion 38 is operatively connected with the works thereof and meshes with the gear te. The clockworks 3d form no part oi my present invention and are shown merely diagrammatically. A earn [iii is secured to the timer shaft 2E and this cam has a lobe, the periphery of which is indicated at fait. The cam lobe has a. drop e2 and a rise fili.

A bracket 5G is provided for supporting the timer housing 3d and is secured by means of screws #i8 to a ange Sii of the motor housing 22. A pivot t is carried by a boss t5 oi the timer housing 2'! on which a bell crank-shaped switch operating lever 54 is pivoted. A rocker '56 is in turn pivoted at 5'? to the lever 5d and has an upper ear 53 and a lower ear te which are adapted to alternately engage the upper and lower edges oi the horizontal portion of the lever 54 during the operation ci the timer as will hereinafter appear. The upper ear 58 is also adapted to coact with the drop the periphery 43 and the rise of the cam My timer mechanism is adapted to actuate a switch for the mixer motor which consists or the following. A switch block t2 is mounted by means of screws Sti on a flange te oi the bracket lic. rthe switch block carries a stop d8, a movable switch blade 76, a stationary switch blade it, and a switch blade actuator Contacts i2 and it are supported by the switch blades le and 'lf3 respectively. A toggle spring d@ is terposed between the switch blade actuator 'id and the movable switch blade iii to secure snap action or the switch. rEhe switch is normally biased to the open position shown in Figure 3 and is adapted to be closed when the switch blade actuator 'it is moved upwardly Afrom the position shown in this figure to the position shown in Figure 6.

Wires ii and 'it are connected with the switch blades lil and 'idrespectivelyl A third wire i3 extends from the current supply and so does the wire il?. The mixer motor is shown at lV in Figure 3 and is connected with the wires il and i3 so as to be in series with the switch contacts 'i2 and l@ for control thereby.

A roller d2 is carried by the upper end of the vertical arm oi the switch operating lever 5d and is adapted to coact with the switch blade actuator 'iS for closing the switch at predetermined times as will appear in the description of the operation of my timer. A control knob i is mounted on the timer shaft 225 and is operatively connccted with the shanl means ci an arm it secured to the shaft and/or the cani lil and exltending into a socket et oi the control knob ad.'

The control knob is provided with suitable indicia t and with graduations Si to cooperate Vwith a pointer Sfiin the control of the timer switch as will be described later.

A detent t@ is mounted on the bracket fie, and

the knob tl is provided with a rear surface el next to the motorY housing 22 from which there is a projection S8 which forms a Vshoulder SS. The center of the projection SB is provided with a notch itil and the shoulder and notch are adapted to coact with the detent S6 during various manipulations oiA the control knob 8c. The

control knob also has a flange to coact at times with the roller 82 as shown in Figure 12.

Practical operation To use my timer for timing purposes, the control knob Bil is rotated clockwise from the off position shown in Figure 1 to any oi the numbers l to 1l shown at $36 and indicating minutes of timing by means of the gradual-tions 32 cooperating with the pointer gli. The switch is open as shown in Figure 3 when the knob Sd is in the Figure l position and the various other parts of the timer are at that time in the position shown in Figures 2, 4 and 5.

As the control knob tl is rotated clockwise as indicated by the arrow a in Figures 7 and 8, the shoulder e@ will leave the detent de as shown in Figure 8 and during the rst part ci the rotation, the drop ft2 of the cam iii will rook the rocker 55 about its pivot 5l as shown by the arrow on the rocker to the position shown in Figure i and at the same time will act on the upper ear in a camming manner to swing the switch operating lever 5ft from the position of Figure 4 to the position oi Figure 7. The roller 82 on the switch operating arm` will at that time engage the switch blade actuator it to move it from the position of Figure 2 to the position ci Figure 6 with the toggle spring iii snapped over center and the contacts 'i2 and it engaged for energizing the motor M.

The operator may continue the rotation of the control knob td, which will also rotate the cam it clockwise such as to the dotted position shown in Figure 9 corresponding to one of the indicia 9@ on the dial or knob 8d. Then when the knob ed is released, the timer spring Sii will rotate the timer shaft 2e counter-clockwise as indicated by the arrow b in Figure 9 which tilts the rocker 5t during the first part or" the movement as from the dotted line to the full-line position of the cam it in this iigure.

Thereafter the cam will continue to rotate throughout the timing period and, upon reaching the position shown in Figure l) (rotation still being counterclockwise as indicated by the arrows c in this iigure and in Figure ll) be in such position relative to the upper ear 5d oi the rocker be that the rocker is about ready to drop at ft2 or" the cam for terminating the timing period. llt will be noted that the shoulder in Figure li has approached the detent and engages it soon after the ear drops it to the oi position that is shown in Figure e. Then with slight fort er rotation of the knob, its shoulder S9 engages the detent tt as in Figure 4;.

When it is de irable tormanually turn the mixer motor on for continuous rotation until such time as it is manually turned ori again, the knob Sli is rotated counterclockwise (instead oi clockwise as for timing) to the position shown Figure 12. The datent de. will then be in the notch it@ as in Figure i3 to retain the knob in this position until it is again turned to the oil position of Figure li. The flange de in Figure l2 engages the roller for turning the switch on independent of the cam de.

Sonie changes may lbe made in the construe tion and arrangement of the parts oi my timer for food mixers without departing from the real spirit and purpose or"V my invention, and it is my intention to cover by my claims any modified forms of 4structureor use or" mechanical equivalents which may be reasonably included within their scope.

I claim as my invention:

1. In a timer, a normally open switch, a timing shaft biased to rotate in one direction, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks, a knob for rotating said shaft manually in either dir ction, a cam on said timing shaft, a switch operating lever coacting with said cam for closing said switch when the knob is rotated in an opposite direction away from the initial position for time setting the timer, said cam when it returns to initial position permitting said switch to reopen due to the coaction of said cam with said lever, and means of cooperation between said knob and said switch when the knob is manually rotated in the first direction, said means effecting closure of said switch independent of said cam.

2. In a timer, a normally open switch, a timing shaft biased -to rotate in one direction, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks, a knob for rotating said shaft manually in either direction, a cam on said timing shaft, a switch operating lever coacting with said cam for closing said switch when the knob is rotated in an opposite direction for time setting the timer, said cam when it returns permitting said switch to reopen due to the coaction of said cam with said lever, detent means to stop the rotation thereof after said switch is opened, and means of cooperation between said shaft and said switch when the knob is further rotated in the first direction against the action of said detent, said last means effecting closure of said switch independent of said cam.

3. In a timer, a normally open switch, a timing shaft biased to rotate in one direction, stop means therefor in an initial position, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks a knob for overcoming said friction drive and rotating said shaft manually in an opposite direction, a cam on said timing shaft, a switch operating lever coacting with said cam for closing said switch when the knob is rotated in said opposite direction away from said initial position for time setting the timer, said cam when it returns to said initial position permitting said switch to reopen due to the coaction of said cam with said lever.

4. In a timer, a normally open switch, a timing shaft biased to rotate in one direction, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks, a knob for rotatingsaid shaft manually in an opposite direction, a cam on said timing shaft, a switch operating lever coacting with said cam for closing said switch when the knob is rotated in said opposite direction for time setting the timer, said cam when it returns permitting said switch to reopen due to the coaction of said cam with said lever.

5. In a timer, a normally open switch, a timing shaft biased to rotate in one direction, stop means therefor in an initial position, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks. a knob for overcoming said friction drive and rotating said shaft manually in either direction, a cam on said timing shaft, a switch operating lever coacting with said cam for closinCr said switch when the knob is rotated in an opposite direction away from said initial position for time setting the timer, said cam when it returns to said initial position permitting said switch to reopen due to the ooaction of said cam with said lever, and means of cooperation between said knob and said switch when the knob is rotated in the first direction, said means of cooperation overcoming said stop means and effecting closure of said switch independent of said cam.

6. fn a timer, a normally open switch, a timing shaft biased to rotate in one direction, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks, a knob for rotating said shaft manually in either direction, a cam on said timing shaft having a lobe, a switch operating lever for coaction therewith, to reopen said switch as said timing shaft rotates in said one direction, and means of cooperation between said knob and said switch when the knob is further rotated in the first direction, said last means effecting closure of said switch independent of said cam.

7. fn a timer, a normally open switch, a timing sha-ft biased to rotate in one direction, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks, a knob for rotating said shaft manually in either direction, a cam on said timing sha-ft having a lobe, a switch operating lever, said lever coacting with said cam for closing said switch when the knob is rotated in one direction for setting the timer, said cam, when it returns to the initial position permitting the switch to reopen, and means of cooperation between said knob and said switch when the knob is further rotated in the first direction, said last means effecting closure of said switch independent of said cam.

8. In a timer, a normally open switch, a timing shaft biased to rotate in one direction, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clockworks, a knob for rotating said shaft manually, a cam on said timing shaft having a lobe, a switch operating lever, said lever coacting with said cam for closing said switch when the lmob is rotated in one direction for setting the timer, said cam, when it returns to the initial position permitting the switch to reopen.

9. ln a timer, a normally open switch, a timing shaft biased to rotate in one direction, clockworks for controlling the rotation thereof in said direction, a friction drive between said shaft and said clcckworks, a knob for rotating said shaft manually, a cam on said timing shaft having lobe, a switch operating lever, said cam when. said knob is released, coacting with said lever to reopen said switch, said knob being' further movable to close said switch and retain it closed independent of said cam,

References Cited in the le 0f this patent FOREIGN PATENTS Number 

